Sorry, had to move everyone a bit to switch to a larger map. It shouldn't affect much.
The stern of the boat rests upright with the splintered hull breach angled toward the sandy ocean floor. A curtain of hanging kelp creates a screen of privacy around the entrance. Malakar brushes aside this screen to look inside.
Inside, the stern is decorated with the skeletal remains of aquatic humanoid creatures, arranged to form a sigil.
And, 50' away from Malakar, two Sahuagin stand ready, with heavy crossbows cocked and loaded.
You saw a scout swimming into the ship, so there is no surprise round - both groups were aware of each other.
Note that Sho is above the shipwreck; Malakar, Razor, and the Sahuagin are inside. Those outside cannot see into the wreck, as the curtain of hanging kelp is in the way.
Brannart: 1d20 + 6 ⇒ (1) + 6 = 7
Fenna: 1d20 + 6 ⇒ (6) + 6 = 12
Malakar: 1d20 + 3 ⇒ (18) + 3 = 21
Sho: 1d20 + 3 ⇒ (7) + 3 = 10
Vexas: 1d20 + 8 ⇒ (1) + 8 = 9
Skorika: 1d20 + 7 ⇒ (11) + 7 = 18
Nameless Scout: 1d20 + 3 ⇒ (5) + 3 = 8